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Sensor MQ-4 Introduction: Sensitive material MQ-4 gas sensors used in clean air, low conductivity tin oxide (SnO2). When there is an environment in which the combustible gas sensor, conductivity sensor with increasing concentration of combustible gases in air increases. Use simple circuit can convert the change in conductivity of the gas concentration corresponding to the output signal. MQ-4 Methane gas sensor of high sensitivity, pane, butane and has a good sensitivity. The sensor can detect a variety of combustible gases, ely natural gas, it is a low-cost sensor suitable for a variety of applications.

Module Applications:

For home or methane gas, natural gas and other monitoring devices, can be tested natural gas, methane 300 to 10000ppm; Module Features: 1, using dual-panel design, with power indicator and a TTL signal output instructions;2, with the switching signal DO?TTL?And AO output analog signal output;3, TTL output valid signal is low.?When the output low signal light can be directly connected microcontroller or relay module?4, the higher the voltage, the voltage concentration analog output higher.5, methane, natural gas has a good detection sensitivity.6, there are four screw holes for easy positioning;7 duct Dimensions: 32 (L) * 20 (W) * 22 (H)8, with a long life and reliable stability9, fast response and resume

Electrical perties: Input voltage: DC5V Power?Electric current?: 150mADO output: TTL digital 0 and 1?0.1 and 5V? AO Output: 0.1-0.3V?Relatively clean?, The maximum concentration of a voltage of about 4V reminder: After the sensor is powered, need to warm about 20S, measured data becomes stable, heat sensor is a normal phenomenon, because the internal heating wire, hot if not normal.

test gram:

Function: This version of the test gram supporting

Use chip: AT89S52

Crystal: 11.0592MHZ

Baud rate: 9600

Compiler Environment: Keil

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